ok, that's because you are on that rom. do you remember what it was before you starting flashing roms
i only ask because someone was on mf3 and thought they rooted and installed a custom recovery, but they didn't. don't see how that is your issue as you successfully flashed a custom rom. but was curious.
you do wipe system when you wipe prior to flashing a rom?
not sure what your issue is, sorry--
---------- Post added at 10:01 PM ---------- Previous post was at 09:57 PM ----------
i didn't know lack of root would keep you from booting--guess so--
back to stock may be answer
or try the reformat of internal card--old things can be on there and mess with new roms
did you try rebooting with no sdcard
ATT Samsung Galaxy S4/Rooted/TWRP 22.214.171.124/KT, Faux, or Audism Kernels/3 Minit, Wanam Xposed, or Gravity Box/Long Time MultiRom Flasher